北京地区电离层COSMIC掩星与垂测仪探测临界频率数据对比

使用COSMIC掩星和垂测仪,探测2011—2012年北京地区电离层临界频率数据,比较不同探测手段获取的电离层特征参量随地方时和地磁季节相关性的变化。研究表明:2组数据具有较好的相关性;标准偏差随地方时变化,日出时6:00 LT开始增大,日落时16:00LT到次高值,19:00LT达最大值后开始下降;标准偏差随地磁季节变化,夏季最小,冬季最大。分析认为,电子密度在垂直和水平方向上的梯度变化,造成掩星反演误差增大,可能导致了数据相关性在不同地磁季节和地方时刻的相应变化。

Comparison of foF2 data obtained by ionosonde observation and COSMIC ionospheric occultation over Beijing

In this paper, foF2 data obtained by COSMIC radio occultation is compared to Beijing ionosonde observation station during 2 years from January 2011 to December 2012. The correlation coefficient and the standard deviation of the observation data obtained by two techniques are calculated and the variations of foF2 difference with local time and geomagnetic season are analyzed. The results show that the correlation of foF2 is good. The standard deviation of foF2 begins to increase from local time of 6:00 at sunrise. It reaches the second peak at local time of 16:00 at sunset. It reaches the highest at local time of 19:00 and then begins to decrease. The standard deviation of foF2 is lower in the geomagnetic summer and is larger in the geomagnetic winter. The gradient of the electron density in the vertical and horizontal directions may increase the error of occultation inversion, which may lead to the corresponding changes of the data correlation in different geomagnetic seasons and local time.